/*

* @由于个人水平有限, 难免有些错误, 还请指点:

* @Author: cpu_code

* @Date: 2020-09-17 13:02:09

* @LastEditTime: 2020-09-17 13:10:59

* @FilePath: \java\aggregation\aggregation15.java

* @Gitee: [https://gitee.com/cpu_code](https://gitee.com/cpu_code)

* @Github: [https://github.com/CPU-Code](https://github.com/CPU-Code)

* @CSDN: [https://blog.csdn.net/qq_44226094](https://blog.csdn.net/qq_44226094)

* @Gitbook: [https://923992029.gitbook.io/cpucode/](https://923992029.gitbook.io/cpucode/)

*/

package aggregation;

import java.util.ArrayList;

import java.util.Collections;

public class aggregation15 {

public static void main(String[] args) {

ArrayList<Student> list = new ArrayList<Student>();

list.add(new Student("cpucode", 22));

list.add(new Student("cpu", 21));

list.add(new Student("hello", 11));

/*

让学生 按照年龄排序 升序

*/

Collections.sort(list);//要求 该list中元素类型 必须实现比较器Comparable接口

for (Student student : list) {

System.out.println(student);

}

}

}

class Student implements Comparable<Student>{

private String name;

private int age;

public Student() {

}

public Student(String name, int age){

this.name = name;

this.age = age;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public void setAge(int age) {

this.age = age;

}

public int getAge() {

return age;

}

@Override

public String toString() {

return "String {" + "name=" + name + '\'' + ", age=" + age + '}';

}

@Override

public int compareTo(Student o) {

return this.age - o.age;

}

}